Acoustics of HVAC Equipment and Environmental Impact on NC Ratings

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Acoustics of HVAC Equipment and Environmental Impact on NC Ratings By Aaron Sorenson – Bosch Applications Engineering

Unwanted noise makes a space uncomfortable and hinders concentration. Excessive noise and vibration are two of the most prevalent complaints from occupants, besides temperature control, and is best dealt with while designing the space. Our objective with this paper is to help the design engineer better understand the basics of acoustics and become familiar with different treatments, methods, or equipment changes that can be applied to the HVAC system to reduce unwanted noise and vibration.

Fundamentals of Acoustics

Noise can be defined as “unwanted or undesired sound, which interferes with speech, concentration, or sleep.” To control the noise, we need to know the frequency (the speed of the vibrations) and amplitude (loudness) of the sound wave(s).


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